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# Validator

`public interface Validator`
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android.service.autofill.Validator

Known indirect subclasses LuhnChecksumValidator, RegexValidator
LuhnChecksumValidator | Validator that returns `true` if the number created by concatenating all given fields pass a Luhn algorithm checksum.
RegexValidator | Defines if a field is valid based on a regular expression (regex).

Class used to define whether a condition is satisfied.

Typically used to avoid displaying the save UI when the user input is invalid.

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